public static Bitmap PrepareForObjectDetection(this System.Drawing.Image bmpOriginalImage, int whiteLevel, bool overrideWhite)
{
Bitmap bmp = (Bitmap)bmpOriginalImage.Clone();
ColorFiltering colorFilter = new ColorFiltering();
int white = whiteLevel;
if (!overrideWhite)
{
white = PreprocessingHelper.GetWhiteLevel(bmp);
}
colorFilter.Red = new IntRange(0, white / 3);
colorFilter.Green = new IntRange(0, white / 3);
colorFilter.Blue = new IntRange(0, white / 3);
colorFilter.FillOutsideRange = true;
colorFilter.FillColor = new RGB(Color.White);
colorFilter.ApplyInPlace(bmp);
ExtractChannel extract_channel = new ExtractChannel(0);
bmp = extract_channel.Apply(bmp);
Invert invert = new Invert();
invert.ApplyInPlace(bmp);
Threshold threshholdFilter = new Threshold(10);
threshholdFilter.ApplyInPlace(bmp);
bmp = bmp.Clone(new Rectangle(0, 0, bmp.Width, bmp.Height), PixelFormat.Format24bppRgb);
return(bmp);
}
public static object ExtractPaperFromPrepapred(this Bitmap PreparedImage, System.Drawing.Image originalImage, bool onlyExtractionPoints, Pattern pattern)
{
BitmapData bitmapData = PreparedImage.LockBits(
new Rectangle(0, 0, PreparedImage.Width, PreparedImage.Height),
ImageLockMode.ReadWrite, PreparedImage.PixelFormat);
BlobCounter blobCounter = new BlobCounter();
int minBlobWidHei = (int)(0.001 * PreparedImage.Width);
blobCounter.FilterBlobs = true;
blobCounter.MinHeight = minBlobWidHei;
blobCounter.MinWidth = minBlobWidHei;
blobCounter.BackgroundThreshold = Color.FromArgb(10, 10, 10);
blobCounter.ProcessImage(bitmapData);
PreparedImage.UnlockBits(bitmapData);
Blob[] blobs = blobCounter.GetObjects((new Bitmap(PreparedImage)), false);
double minbr = pattern.MinSizeRatio; //trebuie setate in baza de date!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! read more about it
double maxbr = pattern.MaxSizeRatio;
List <IntPoint> quad = new List <IntPoint>();
List <Blob> suspectBlobs = new List <Blob>();
for (int i = 0; i < blobs.Length; i++)
{
int area = blobs[i].Image.Width * blobs[i].Image.Height;
if (
((double)area) / ((double)PreparedImage.Width * PreparedImage.Height) > minbr &&
((double)area) / ((double)PreparedImage.Width * PreparedImage.Height) < maxbr
&&
((double)blobs[i].Rectangle.Width / (double)blobs[i].Rectangle.Height <1.3 &&
(double)(double)blobs[i].Rectangle.Width / (double)blobs[i].Rectangle.Height> .7)
)
{
suspectBlobs.Add(blobs[i]);
}
}
blobs = suspectBlobs.ToArray();
System.Drawing.Image compImg = System.Drawing.Image.FromFile(HttpContext.Current.Server.MapPath("~/omrtemp/lc.jpg"));
UnmanagedImage compUMImg = UnmanagedImage.FromManagedImage((Bitmap)compImg);
foreach (Blob blob in blobs)
{
if (blob.Rectangle.X < (PreparedImage.Width) / 2)
{
compUMImg = UnmanagedImage.FromManagedImage(PreprocessingHelper.ResizeImage(compImg, blob.Rectangle.Width, blob.Rectangle.Height));
if (blob.Image.IsSameAs(compUMImg))
{
quad.Add(new IntPoint((int)blob.CenterOfGravity.X, (int)blob.CenterOfGravity.Y));
}
}
}
if (quad.Count > 1)
{
if (quad[0].Y > quad[1].Y)
{
IntPoint tp = quad[0];
quad[0] = quad[1];
quad[1] = tp;
}
}
compImg = System.Drawing.Image.FromFile(HttpContext.Current.Server.MapPath("~/omrtemp/rc.jpg"));
compUMImg = UnmanagedImage.FromManagedImage((Bitmap)compImg);
foreach (Blob blob in blobs)
{
if (blob.Rectangle.X > (PreparedImage.Width * 3) / 4)
{
compUMImg = UnmanagedImage.FromManagedImage(PreprocessingHelper.ResizeImage(compImg, blob.Rectangle.Width, blob.Rectangle.Height));
if (blob.Image.IsSameAs(compUMImg))
{
quad.Add(new IntPoint((int)blob.CenterOfGravity.X, (int)blob.CenterOfGravity.Y));
}
}
}
if (quad.Count > 3)
{
if (quad[2].Y < quad[3].Y)
{
IntPoint tp = quad[2];
quad[2] = quad[3];
quad[3] = tp;
}
}
if (quad.Count == 4)
{
if (((double)quad[1].Y - (double)quad[0].Y) / ((double)quad[2].Y - (double)quad[3].Y) < .75 ||
((double)quad[1].Y - (double)quad[0].Y) / ((double)quad[2].Y - (double)quad[3].Y) > 1.25)
{
quad.Clear();
}
else if (quad[0].X > PreparedImage.Width / 2 || quad[1].X > PreparedImage.Width / 2 || quad[2].X < PreparedImage.Width / 2 || quad[3].X < PreparedImage.Width / 2)
{
quad.Clear();
}
}
IntPoint tp2 = quad[3];
quad[3] = quad[1];
quad[1] = tp2;
return(quad);
}
